After owning Hafler, NYAL Moscode,B&K, Mitsubishi, and Discrete Technology separate amps,as well as many receivers and integrated amps, my view is that it’s pretty easy to tell a good tube amp from a solid state amp with good speakers without headphones
It’s the clarity through the mids and highs of my Dynaco and VTA tube amps thatbrings that holographic soundstage.
What reasonably priced tubes generally don’t do as well on is bass authority,